Exhaust air valve

Details Exhaust air valve Exhaust air valve

1982-07-23

1985-03-19

Word, A. Hugo

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D23139

Patent

active

D02780798

REFERENCES:
patent: 2620673 (1952-12-01), Whitcomb
patent: 3315585 (1967-04-01), Hawkins et al.
patent: 3951130 (1976-04-01), Lowe
patent: 4059045 (1977-11-01), McClain
patent: 4103495 (1978-08-01), Graham

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